import java.sql.DataTruncation;

public class Test {
    public static void main(String[] args) {
        /*long b = 10L;
        int i = 3;
        i += b;  //-> i = i + b;
        System.out.println(i);*/
      /*  byte b1 = 1;
        byte b2 = 127;
       // b2 += b1;

        System.out.println(b2);//截断的*

       */
        String str="234";
        int a=Integer.parseInt(str);
        System.out.println(a);
       int r=123;
       String str1=String.valueOf(r);
        System.out.println(str1);
        String str2=Integer.toString(r);
        System.out.println(str2);
        byte b1 = 10;
        byte b2 = 20;
        //< 4个字节的  数据 会提升为4个字节再运算
      //  byte b3 = b1+b2;
       float f=1.4;
       float t=1;
       float c=1.4f;
       double e=1.2;
       double d=1;

    }
}
